A background should sit behind the text, not in place of it. This paragraph lies on the tile at its true scale — if it reads without effort, the tile can go under content.
Blurred plaid-like grid of cyan, lilac and olive-green bands crossed by dark red lines, with framed square cells of olive and red enclosing soft pale-blue centers. Star-shaped red-orange accents sit at the crossings, and the cells and bands repeat in a regular, evenly spaced rhythm across the field.
CC0 — use it for anything, no attribution needed.